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eelcor

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  1. Like
    eelcor got a reaction from dinhlongbk93 in [Energia Library] NFC card reading with Energia - MF RC 522   
    Hi everybody,
     
    >>> UPDATE - Made "proper" Energia Library out of it. Now with proper named methods/class members<<<
     
    >>> UPDATE 2 - Added "keywords.txt" file for syntax highlighting, added comments to "Mfrc522.cpp" file explaining methods (thanks to Grant) - Added example to read cards contents of block 1 <<<
     
    >>> UPDATE 3 - You need to apply the USCI SPI fix proposed by Spirilis (post #22) in the following thread: http://forum.43oh.com/topic/3237-energia-library-nordic-nrf24l01-library/page-2 , otherwise the card reader won't work! <<<<
     
    I wanted to share my results with the MF RC522 RFID reader. I found an article from Grant Gibson (http://www.grantgibson.co.uk/blog/2012/04/how-to-get-started-with-the-mifare-mf522-an-and-arduino/#comments) where he used a cheap reader from eBay to read Mifare cards.  (http://www.ebay.com/itm/Mifare-RC522-RFID-13-56Mhz-Module-SPI-Interface-with-a-IC-Card-/370690680474?pt=LH_DefaultDomain_0&hash=item564ee2e69a)
     
    The command set and technical aspects of the MFRC522 chip can be found in the datasheet: http://www.nxp.com/documents/data_sheet/MFRC522.pdf
     
    I have ported the example to Energia. Very simple by removing all Chinese comments and replacing uchar with unsigned chars. 
     
    After these changes it works like a charm. 
     
    Just connect the following lines:
    MOSI LP -> Pin 3 of the module
    MISO LP -> Pin 4 of the module
    PIn 1.3 LP -> Pin 1 of the module (SS)
    Pin 2.2 LP -> Pin 7 of the module (RST)
    Pin 1.5 LP -> Pin 2 of the module (SCK)
    GND LP -> Pin 6 of the module
    VCC LP -> Pin 8 of the module
    Pin 5 is not connected.
     
    Included is the sketch (Mfrc522.zip) I used. Now onto opening doors and paying electronically!
     
    Kind regards, 
     
    Eelco


  2. Like
    eelcor got a reaction from kimikien in [Energia Library] NFC card reading with Energia - MF RC 522   
    Hi everybody,
     
    >>> UPDATE - Made "proper" Energia Library out of it. Now with proper named methods/class members<<<
     
    >>> UPDATE 2 - Added "keywords.txt" file for syntax highlighting, added comments to "Mfrc522.cpp" file explaining methods (thanks to Grant) - Added example to read cards contents of block 1 <<<
     
    >>> UPDATE 3 - You need to apply the USCI SPI fix proposed by Spirilis (post #22) in the following thread: http://forum.43oh.com/topic/3237-energia-library-nordic-nrf24l01-library/page-2 , otherwise the card reader won't work! <<<<
     
    I wanted to share my results with the MF RC522 RFID reader. I found an article from Grant Gibson (http://www.grantgibson.co.uk/blog/2012/04/how-to-get-started-with-the-mifare-mf522-an-and-arduino/#comments) where he used a cheap reader from eBay to read Mifare cards.  (http://www.ebay.com/itm/Mifare-RC522-RFID-13-56Mhz-Module-SPI-Interface-with-a-IC-Card-/370690680474?pt=LH_DefaultDomain_0&hash=item564ee2e69a)
     
    The command set and technical aspects of the MFRC522 chip can be found in the datasheet: http://www.nxp.com/documents/data_sheet/MFRC522.pdf
     
    I have ported the example to Energia. Very simple by removing all Chinese comments and replacing uchar with unsigned chars. 
     
    After these changes it works like a charm. 
     
    Just connect the following lines:
    MOSI LP -> Pin 3 of the module
    MISO LP -> Pin 4 of the module
    PIn 1.3 LP -> Pin 1 of the module (SS)
    Pin 2.2 LP -> Pin 7 of the module (RST)
    Pin 1.5 LP -> Pin 2 of the module (SCK)
    GND LP -> Pin 6 of the module
    VCC LP -> Pin 8 of the module
    Pin 5 is not connected.
     
    Included is the sketch (Mfrc522.zip) I used. Now onto opening doors and paying electronically!
     
    Kind regards, 
     
    Eelco


  3. Like
    eelcor got a reaction from Rustik in [Energia Library] NFC card reading with Energia - MF RC 522   
    Hi everybody,
     
    >>> UPDATE - Made "proper" Energia Library out of it. Now with proper named methods/class members<<<
     
    >>> UPDATE 2 - Added "keywords.txt" file for syntax highlighting, added comments to "Mfrc522.cpp" file explaining methods (thanks to Grant) - Added example to read cards contents of block 1 <<<
     
    >>> UPDATE 3 - You need to apply the USCI SPI fix proposed by Spirilis (post #22) in the following thread: http://forum.43oh.com/topic/3237-energia-library-nordic-nrf24l01-library/page-2 , otherwise the card reader won't work! <<<<
     
    I wanted to share my results with the MF RC522 RFID reader. I found an article from Grant Gibson (http://www.grantgibson.co.uk/blog/2012/04/how-to-get-started-with-the-mifare-mf522-an-and-arduino/#comments) where he used a cheap reader from eBay to read Mifare cards.  (http://www.ebay.com/itm/Mifare-RC522-RFID-13-56Mhz-Module-SPI-Interface-with-a-IC-Card-/370690680474?pt=LH_DefaultDomain_0&hash=item564ee2e69a)
     
    The command set and technical aspects of the MFRC522 chip can be found in the datasheet: http://www.nxp.com/documents/data_sheet/MFRC522.pdf
     
    I have ported the example to Energia. Very simple by removing all Chinese comments and replacing uchar with unsigned chars. 
     
    After these changes it works like a charm. 
     
    Just connect the following lines:
    MOSI LP -> Pin 3 of the module
    MISO LP -> Pin 4 of the module
    PIn 1.3 LP -> Pin 1 of the module (SS)
    Pin 2.2 LP -> Pin 7 of the module (RST)
    Pin 1.5 LP -> Pin 2 of the module (SCK)
    GND LP -> Pin 6 of the module
    VCC LP -> Pin 8 of the module
    Pin 5 is not connected.
     
    Included is the sketch (Mfrc522.zip) I used. Now onto opening doors and paying electronically!
     
    Kind regards, 
     
    Eelco


  4. Like
    eelcor got a reaction from yosh in ESP8266 - IoT on the cheap ;)   
    Hi everybody,
     
    People might have read the hackaday post describing the ESP8266. The ESP8266 is a really low price Wifi chip, which uses serial communication (just like the Wifly etc.) to connect to wifi. Although the CC3100 and CC3200 are the better chips, the ESP8266 main differentiating point is its ridiculous low price. I've ordered 8 for $3.50 each (aliexpress). It doesn't seem to support IPv6 out of the box, but there is an SDK, which might open future possibilities.
     
    I was thinking to make a library for energia to support the ESP8266. Anyone interested? Are there specific starting points to make this library usable?
     
    I am looking at two scenario's:
    - MQTT client - Relaying sensor data or control.
    - Web service - Returning a JSON object with sensor data.
     
    It would be nice to use the hooks of an ethernet library and only need to process strings/arrays of bytes. 
     
    Edit: As this wifi dongle uses an UART, how do I create two UARTS on a G2553?
     
    Kind regards,
     
    Eelco Rouw
  5. Like
    eelcor got a reaction from Automate in ESP8266 - IoT on the cheap ;)   
    Hi everybody,
     
    People might have read the hackaday post describing the ESP8266. The ESP8266 is a really low price Wifi chip, which uses serial communication (just like the Wifly etc.) to connect to wifi. Although the CC3100 and CC3200 are the better chips, the ESP8266 main differentiating point is its ridiculous low price. I've ordered 8 for $3.50 each (aliexpress). It doesn't seem to support IPv6 out of the box, but there is an SDK, which might open future possibilities.
     
    I was thinking to make a library for energia to support the ESP8266. Anyone interested? Are there specific starting points to make this library usable?
     
    I am looking at two scenario's:
    - MQTT client - Relaying sensor data or control.
    - Web service - Returning a JSON object with sensor data.
     
    It would be nice to use the hooks of an ethernet library and only need to process strings/arrays of bytes. 
     
    Edit: As this wifi dongle uses an UART, how do I create two UARTS on a G2553?
     
    Kind regards,
     
    Eelco Rouw
  6. Like
    eelcor got a reaction from spirilis in Any news regarding the CC3200 launchpad?   
    just hack into my iCloud account...
  7. Like
    eelcor got a reaction from abecedarian in Any news regarding the CC3200 launchpad?   
    just hack into my iCloud account...
  8. Like
    eelcor got a reaction from vgy in [Energia Library] NFC card reading with Energia - MF RC 522   
    Hi everybody,
     
    >>> UPDATE - Made "proper" Energia Library out of it. Now with proper named methods/class members<<<
     
    >>> UPDATE 2 - Added "keywords.txt" file for syntax highlighting, added comments to "Mfrc522.cpp" file explaining methods (thanks to Grant) - Added example to read cards contents of block 1 <<<
     
    >>> UPDATE 3 - You need to apply the USCI SPI fix proposed by Spirilis (post #22) in the following thread: http://forum.43oh.com/topic/3237-energia-library-nordic-nrf24l01-library/page-2 , otherwise the card reader won't work! <<<<
     
    I wanted to share my results with the MF RC522 RFID reader. I found an article from Grant Gibson (http://www.grantgibson.co.uk/blog/2012/04/how-to-get-started-with-the-mifare-mf522-an-and-arduino/#comments) where he used a cheap reader from eBay to read Mifare cards.  (http://www.ebay.com/itm/Mifare-RC522-RFID-13-56Mhz-Module-SPI-Interface-with-a-IC-Card-/370690680474?pt=LH_DefaultDomain_0&hash=item564ee2e69a)
     
    The command set and technical aspects of the MFRC522 chip can be found in the datasheet: http://www.nxp.com/documents/data_sheet/MFRC522.pdf
     
    I have ported the example to Energia. Very simple by removing all Chinese comments and replacing uchar with unsigned chars. 
     
    After these changes it works like a charm. 
     
    Just connect the following lines:
    MOSI LP -> Pin 3 of the module
    MISO LP -> Pin 4 of the module
    PIn 1.3 LP -> Pin 1 of the module (SS)
    Pin 2.2 LP -> Pin 7 of the module (RST)
    Pin 1.5 LP -> Pin 2 of the module (SCK)
    GND LP -> Pin 6 of the module
    VCC LP -> Pin 8 of the module
    Pin 5 is not connected.
     
    Included is the sketch (Mfrc522.zip) I used. Now onto opening doors and paying electronically!
     
    Kind regards, 
     
    Eelco


  9. Like
    eelcor got a reaction from phaseform in [Energia Library] NFC card reading with Energia - MF RC 522   
    Hi everybody,
     
    >>> UPDATE - Made "proper" Energia Library out of it. Now with proper named methods/class members<<<
     
    >>> UPDATE 2 - Added "keywords.txt" file for syntax highlighting, added comments to "Mfrc522.cpp" file explaining methods (thanks to Grant) - Added example to read cards contents of block 1 <<<
     
    >>> UPDATE 3 - You need to apply the USCI SPI fix proposed by Spirilis (post #22) in the following thread: http://forum.43oh.com/topic/3237-energia-library-nordic-nrf24l01-library/page-2 , otherwise the card reader won't work! <<<<
     
    I wanted to share my results with the MF RC522 RFID reader. I found an article from Grant Gibson (http://www.grantgibson.co.uk/blog/2012/04/how-to-get-started-with-the-mifare-mf522-an-and-arduino/#comments) where he used a cheap reader from eBay to read Mifare cards.  (http://www.ebay.com/itm/Mifare-RC522-RFID-13-56Mhz-Module-SPI-Interface-with-a-IC-Card-/370690680474?pt=LH_DefaultDomain_0&hash=item564ee2e69a)
     
    The command set and technical aspects of the MFRC522 chip can be found in the datasheet: http://www.nxp.com/documents/data_sheet/MFRC522.pdf
     
    I have ported the example to Energia. Very simple by removing all Chinese comments and replacing uchar with unsigned chars. 
     
    After these changes it works like a charm. 
     
    Just connect the following lines:
    MOSI LP -> Pin 3 of the module
    MISO LP -> Pin 4 of the module
    PIn 1.3 LP -> Pin 1 of the module (SS)
    Pin 2.2 LP -> Pin 7 of the module (RST)
    Pin 1.5 LP -> Pin 2 of the module (SCK)
    GND LP -> Pin 6 of the module
    VCC LP -> Pin 8 of the module
    Pin 5 is not connected.
     
    Included is the sketch (Mfrc522.zip) I used. Now onto opening doors and paying electronically!
     
    Kind regards, 
     
    Eelco


  10. Like
    eelcor got a reaction from bluehash in [Tip] Nice realtime clock with the PCF8563   
    Hi everybody,
     
    As a part of my long term project building wireless sensor nodes, I have been looking for a nice RTC chip. First I was drawn to the DS1307, but this part is 5V and only a clock without alarm functions. Googling to the internet I've found the PCF8563. This part is a "drop in" replacement for the DS1307, but offers a lower supply voltage (3.3V) and includes alarm functions. The chips can be sourced quite cheap from the internet and work like a charm with both 6pf and 12pf 32768kHz crystals.
     
    A nice tutorial how to connect these things can be found using the following link: http://startingelectronics.com/beginners/start-electronics-now/tut16-arduino-clock/
     
    It is written for the Arduino but can be adapted easily to the launchpad. Just change the LiquidCrystal pins to free pins on the Arduino and voila there you have a nice RTC that can be used for sprinkler projects or other projects. The alarm can be set on different days of the week (not a specific date), but with some program logic a calendared version should be possible.
     
    I am thinking of writing a library out of the tutorial. Anyone interested?
     
    Kind regards,
     
    Eelco
  11. Like
    eelcor got a reaction from chibiace in [Tip] Nice realtime clock with the PCF8563   
    Hi everybody,
     
    As a part of my long term project building wireless sensor nodes, I have been looking for a nice RTC chip. First I was drawn to the DS1307, but this part is 5V and only a clock without alarm functions. Googling to the internet I've found the PCF8563. This part is a "drop in" replacement for the DS1307, but offers a lower supply voltage (3.3V) and includes alarm functions. The chips can be sourced quite cheap from the internet and work like a charm with both 6pf and 12pf 32768kHz crystals.
     
    A nice tutorial how to connect these things can be found using the following link: http://startingelectronics.com/beginners/start-electronics-now/tut16-arduino-clock/
     
    It is written for the Arduino but can be adapted easily to the launchpad. Just change the LiquidCrystal pins to free pins on the Arduino and voila there you have a nice RTC that can be used for sprinkler projects or other projects. The alarm can be set on different days of the week (not a specific date), but with some program logic a calendared version should be possible.
     
    I am thinking of writing a library out of the tutorial. Anyone interested?
     
    Kind regards,
     
    Eelco
  12. Like
    eelcor got a reaction from Rickta59 in [Tip] Nice realtime clock with the PCF8563   
    Hi everybody,
     
    As a part of my long term project building wireless sensor nodes, I have been looking for a nice RTC chip. First I was drawn to the DS1307, but this part is 5V and only a clock without alarm functions. Googling to the internet I've found the PCF8563. This part is a "drop in" replacement for the DS1307, but offers a lower supply voltage (3.3V) and includes alarm functions. The chips can be sourced quite cheap from the internet and work like a charm with both 6pf and 12pf 32768kHz crystals.
     
    A nice tutorial how to connect these things can be found using the following link: http://startingelectronics.com/beginners/start-electronics-now/tut16-arduino-clock/
     
    It is written for the Arduino but can be adapted easily to the launchpad. Just change the LiquidCrystal pins to free pins on the Arduino and voila there you have a nice RTC that can be used for sprinkler projects or other projects. The alarm can be set on different days of the week (not a specific date), but with some program logic a calendared version should be possible.
     
    I am thinking of writing a library out of the tutorial. Anyone interested?
     
    Kind regards,
     
    Eelco
  13. Like
    eelcor got a reaction from Desmond in [Tip] Nice realtime clock with the PCF8563   
    Hi everybody,
     
    As a part of my long term project building wireless sensor nodes, I have been looking for a nice RTC chip. First I was drawn to the DS1307, but this part is 5V and only a clock without alarm functions. Googling to the internet I've found the PCF8563. This part is a "drop in" replacement for the DS1307, but offers a lower supply voltage (3.3V) and includes alarm functions. The chips can be sourced quite cheap from the internet and work like a charm with both 6pf and 12pf 32768kHz crystals.
     
    A nice tutorial how to connect these things can be found using the following link: http://startingelectronics.com/beginners/start-electronics-now/tut16-arduino-clock/
     
    It is written for the Arduino but can be adapted easily to the launchpad. Just change the LiquidCrystal pins to free pins on the Arduino and voila there you have a nice RTC that can be used for sprinkler projects or other projects. The alarm can be set on different days of the week (not a specific date), but with some program logic a calendared version should be possible.
     
    I am thinking of writing a library out of the tutorial. Anyone interested?
     
    Kind regards,
     
    Eelco
  14. Like
    eelcor got a reaction from D69 in [Energia Library] NFC card reading with Energia - MF RC 522   
    Yup,
     
    That should do the trick. I think I have reproduced your error. The card is detected 2 times in my case, but the data is corrupted, so it gives the wrong output. I applied the usci spi fix from my earlier post et voila, it works like charm! Can you try it as well?
     
    Kind regards, Eelco
  15. Like
    eelcor got a reaction from bluehash in [Energia Library] NFC card reading with Energia - MF RC 522   
    Okay guys,
     
    Did some work this morning to transform the test code into a proper library. It should be more usable and generic. I haven't made a "keywords.txt". The methods should be self explanatory when consulting the datasheet. There is only one example that reads cards and recognizes specific cards. 
     
    I works like a charm however and can be added to the Energia libraries.
     
    I have replaced the original file with the library zip in the top post. I think the library also works with the stellaris launchpad.
     
    Kind regards, Eelco
  16. Like
    eelcor got a reaction from energia in [Energia Library] NFC card reading with Energia - MF RC 522   
    Hi everybody,
     
    >>> UPDATE - Made "proper" Energia Library out of it. Now with proper named methods/class members<<<
     
    >>> UPDATE 2 - Added "keywords.txt" file for syntax highlighting, added comments to "Mfrc522.cpp" file explaining methods (thanks to Grant) - Added example to read cards contents of block 1 <<<
     
    >>> UPDATE 3 - You need to apply the USCI SPI fix proposed by Spirilis (post #22) in the following thread: http://forum.43oh.com/topic/3237-energia-library-nordic-nrf24l01-library/page-2 , otherwise the card reader won't work! <<<<
     
    I wanted to share my results with the MF RC522 RFID reader. I found an article from Grant Gibson (http://www.grantgibson.co.uk/blog/2012/04/how-to-get-started-with-the-mifare-mf522-an-and-arduino/#comments) where he used a cheap reader from eBay to read Mifare cards.  (http://www.ebay.com/itm/Mifare-RC522-RFID-13-56Mhz-Module-SPI-Interface-with-a-IC-Card-/370690680474?pt=LH_DefaultDomain_0&hash=item564ee2e69a)
     
    The command set and technical aspects of the MFRC522 chip can be found in the datasheet: http://www.nxp.com/documents/data_sheet/MFRC522.pdf
     
    I have ported the example to Energia. Very simple by removing all Chinese comments and replacing uchar with unsigned chars. 
     
    After these changes it works like a charm. 
     
    Just connect the following lines:
    MOSI LP -> Pin 3 of the module
    MISO LP -> Pin 4 of the module
    PIn 1.3 LP -> Pin 1 of the module (SS)
    Pin 2.2 LP -> Pin 7 of the module (RST)
    Pin 1.5 LP -> Pin 2 of the module (SCK)
    GND LP -> Pin 6 of the module
    VCC LP -> Pin 8 of the module
    Pin 5 is not connected.
     
    Included is the sketch (Mfrc522.zip) I used. Now onto opening doors and paying electronically!
     
    Kind regards, 
     
    Eelco


  17. Like
    eelcor got a reaction from pine in [Energia Library] NFC card reading with Energia - MF RC 522   
    Hi everybody,
     
    >>> UPDATE - Made "proper" Energia Library out of it. Now with proper named methods/class members<<<
     
    >>> UPDATE 2 - Added "keywords.txt" file for syntax highlighting, added comments to "Mfrc522.cpp" file explaining methods (thanks to Grant) - Added example to read cards contents of block 1 <<<
     
    >>> UPDATE 3 - You need to apply the USCI SPI fix proposed by Spirilis (post #22) in the following thread: http://forum.43oh.com/topic/3237-energia-library-nordic-nrf24l01-library/page-2 , otherwise the card reader won't work! <<<<
     
    I wanted to share my results with the MF RC522 RFID reader. I found an article from Grant Gibson (http://www.grantgibson.co.uk/blog/2012/04/how-to-get-started-with-the-mifare-mf522-an-and-arduino/#comments) where he used a cheap reader from eBay to read Mifare cards.  (http://www.ebay.com/itm/Mifare-RC522-RFID-13-56Mhz-Module-SPI-Interface-with-a-IC-Card-/370690680474?pt=LH_DefaultDomain_0&hash=item564ee2e69a)
     
    The command set and technical aspects of the MFRC522 chip can be found in the datasheet: http://www.nxp.com/documents/data_sheet/MFRC522.pdf
     
    I have ported the example to Energia. Very simple by removing all Chinese comments and replacing uchar with unsigned chars. 
     
    After these changes it works like a charm. 
     
    Just connect the following lines:
    MOSI LP -> Pin 3 of the module
    MISO LP -> Pin 4 of the module
    PIn 1.3 LP -> Pin 1 of the module (SS)
    Pin 2.2 LP -> Pin 7 of the module (RST)
    Pin 1.5 LP -> Pin 2 of the module (SCK)
    GND LP -> Pin 6 of the module
    VCC LP -> Pin 8 of the module
    Pin 5 is not connected.
     
    Included is the sketch (Mfrc522.zip) I used. Now onto opening doors and paying electronically!
     
    Kind regards, 
     
    Eelco


  18. Like
    eelcor got a reaction from bluehash in [Energia Library] NFC card reading with Energia - MF RC 522   
    Hi everybody,
     
    >>> UPDATE - Made "proper" Energia Library out of it. Now with proper named methods/class members<<<
     
    >>> UPDATE 2 - Added "keywords.txt" file for syntax highlighting, added comments to "Mfrc522.cpp" file explaining methods (thanks to Grant) - Added example to read cards contents of block 1 <<<
     
    >>> UPDATE 3 - You need to apply the USCI SPI fix proposed by Spirilis (post #22) in the following thread: http://forum.43oh.com/topic/3237-energia-library-nordic-nrf24l01-library/page-2 , otherwise the card reader won't work! <<<<
     
    I wanted to share my results with the MF RC522 RFID reader. I found an article from Grant Gibson (http://www.grantgibson.co.uk/blog/2012/04/how-to-get-started-with-the-mifare-mf522-an-and-arduino/#comments) where he used a cheap reader from eBay to read Mifare cards.  (http://www.ebay.com/itm/Mifare-RC522-RFID-13-56Mhz-Module-SPI-Interface-with-a-IC-Card-/370690680474?pt=LH_DefaultDomain_0&hash=item564ee2e69a)
     
    The command set and technical aspects of the MFRC522 chip can be found in the datasheet: http://www.nxp.com/documents/data_sheet/MFRC522.pdf
     
    I have ported the example to Energia. Very simple by removing all Chinese comments and replacing uchar with unsigned chars. 
     
    After these changes it works like a charm. 
     
    Just connect the following lines:
    MOSI LP -> Pin 3 of the module
    MISO LP -> Pin 4 of the module
    PIn 1.3 LP -> Pin 1 of the module (SS)
    Pin 2.2 LP -> Pin 7 of the module (RST)
    Pin 1.5 LP -> Pin 2 of the module (SCK)
    GND LP -> Pin 6 of the module
    VCC LP -> Pin 8 of the module
    Pin 5 is not connected.
     
    Included is the sketch (Mfrc522.zip) I used. Now onto opening doors and paying electronically!
     
    Kind regards, 
     
    Eelco


  19. Like
    eelcor reacted to boarboar in Porting the Mirf/Nrf24 library   
    Actually, this one is working correctly:
     
    http://www.open.com.au/mikem/arduino/NRF24/
     
    Do not forget to supply the constructor with the correct PIN numbers for CSN and CE.
     
    And be aware of the SPI issue with 2553 -
     
    http://forum.43oh.com/topic/3163-fixed-%E2%80%94-msp430g2553-spi-issue-first-byte-not-read/
     
    You'll need to fix usci_spi.cpp. (Alternatively - change the library adding fake reads)
     
    Br
    Alexander
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